Question

Find the total cost paid by Dan for all the halloween costumes.

• A. $5,650
• B. $5,750
• C. $5,550
• D. $5,700

Answer 1

The correct option is B $5,750

Number of costumes ordered by Dan = 230
$\text{Cost of 1 costume}=\$25$

$\text{∴ Cost of all the costumes}=230\times \$25$

Solving by lattice multiplication:

Step 1: Draw a 3x2 table and on top and right, just put the digits:


Step 2: Draw the diagonals and write the digits in the boxes:

Step 3: Add the digits along the diagonal and write them from the left side to the right side:


So, total cost for all the costumes paid by Dan is $5,750.